摘要
运用岩石地层学的方法对湘西沅麻盆地的白垩系作了如下划分：石门组及东井组，为一个向上变细的基本层序。栏垅组为一个厚度巨大、向上变细的基本层序：该基本层序下部称为下段，全部由砾岩层组成；该基本层序上部为上段，由粉砂岩、粉砂质细晶灰岩、褐铁质泥岩组成。神皇山组则根据基本层序垂向序列组合特点差异划分为３个类型：类型Ⅰ，向上由粗→细的变化特点；类型Ⅱ，向上由细→粗→细的变化特点；类型Ⅲ，仍为向上变细的基本层序。
Based on the method of lithostratigraphy,the Cretaceous System in YuanlingMayang Basin is divided into:the Shimen and Dongjing Formations consisting of a finingupward fundamental sequence.The Lanlong Formation is composed of a fining upward fundamental sequence of great thickness,of which the lower member is the lower part of the fundamental sequence consisting of conglomerate layers,and the upper member is the upper part of fundamental sequence consisting of siltstone,silty cryptomerous limestone and limonite mudstone.Based on the vertical differential combination of fundamental sequences,the Shenhuangshan Formation is classified into three types:typeⅠ,characterized by a change in grainsize from coarseness to fineness upward;typeⅡ,characterized by a change in grainsize from fineness to coarseness and again to fineness upward;type Ⅲ,characterized by a finingupward fundamental sequence.
出处
《地层学杂志》
CSCD
北大核心
1998年第3期201-205,215,共6页
Journal of Stratigraphy
关键词
基本层序
岩石地层
沅麻盆地
白垩系
fundamental sequence, lithostatigraphy, Cretaceous, YuanlingMayang ba sin, Hunan
